Browse Prior Art Database

Gas Leak Detection

IP.com Disclosure Number: IPCOM000082997D
Original Publication Date: 1975-Mar-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Anderson, LC: AUTHOR

Abstract

In fabricating a gas panel display, a pair of glass substrates 1 and 3 have orthogonal conductor arrays 5 and 7 formed thereon with dielectric layers 9 and 11 formed over the conductors, while refractory coatings 13 and 15, respectively, are used to protect the dielectric surface against sputtering. Plates 1 and 3 are then sealed about their edges by edge seals 17, 19, and tubulation member 21 used for evacuation and backfilling with the appropriate gas mixture is also sealed about the upper plate by seal 23.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 72% of the total text.

Page 1 of 2

Gas Leak Detection

In fabricating a gas panel display, a pair of glass substrates 1 and 3 have orthogonal conductor arrays 5 and 7 formed thereon with dielectric layers 9 and 11 formed over the conductors, while refractory coatings 13 and 15, respectively, are used to protect the dielectric surface against sputtering. Plates 1 and 3 are then sealed about their edges by edge seals 17, 19, and tubulation member 21 used for evacuation and backfilling with the appropriate gas mixture is also sealed about the upper plate by seal 23.

One of the problems in fabricating these devices is that of seal integrity in that minute leaks may occur in the sealed areas, either at the edge sealing of the plates 1, 3 or at the sealing of the tubulation member 21. Once such leaks occur, the panel is defective and cannot be maintained at the recommended temperature and pressure. However, such leaks are so minute that they are extremely difficult to detect at the time of fabrication. and defective panels with minute leaks might test in operable condition.

In this method for testing for minute leaks in a gas panel, the panel is filled through the tubulation member 21 with hydrogen sulfide gas. An indicator of lead acetate having a chemical composition Pb (C(2)H(3)O(2)) in a polyvinyl alcohol binder is spread over all exterior edge seals. The panel is then placed in an oven for approximately 12 hours at a temperature of 100 degrees C, which creates a higher pressure within the panel and...